write down an inequality to show the range of value of y if x≤ -4.
y=-5/6( 2+5x )
唔識做功課17
2014-01-02 11:43 pm
回答 (1)
2014-01-03 12:36 am
✔ 最佳答案
y = -5/6 (2+5x)先找出x = ???6y = -5(2+5x)6y+10=-25xx = -(6y+10)/25 if x £ -4 Set this inequality for the x equation: -(6y+10)/25 £ -4-(6y+10) £ -1006y+10 ³ 100 [注意當-ve,-ve得正時不等號反倒過來的 – 負數少於正數便會大於]6y ³ 90y ³ 15
參考: 做完可代入x=-5(即是少於-4)測試 y的答案是否大於15?作最後自己考證。
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